Abstract: Methods and systems are provided herein for a dust box cleanout routine of an evaporative emissions control (EVAP) system of a vehicle. In one example, a method is provided for an engine of a vehicle, comprising, during travel on an unpaved road, selectively discharging a dust box housed in a vent line of an evaporative emissions control (EVAP) system by opening a discharge valve of the dust box leading to atmosphere. In this way, an accumulation of dust on the air filter and in the dust box of the EVAP system may be reduced, thereby maintaining an efficiency of the EVAP system.

Abstract: A compressed-air supply system for operating a pneumatic installation includes a reservoir, a number of bellows, a pressure-air feed to which a charging assembly having a compressor is connected on a pressure-medium feed side, a pressure-air connection to the pneumatic installation, a venting connection to the environment, a pneumatic main line between the pressure-air feed and the pressure-air connection, a vent line between the pressure-air feed and the venting connection and a changeover valve associated with the pressure-air feed and configured to be controlled by pressure air in such a way that the pressure-air feed is open or can be opened via the changeover valve to the main line. A flow pressure at the pressure-air feed can be generated by the charging assembly to the main line.

Abstract: A moisture condensate separator for use with an air compressor and a pneumatic machine includes a body, a separation assembly, and a valve assembly. The body may define an interior chamber including a condensate accumulation zone, a compressor supply inlet, a machine supply outlet, a cylinder, an auxiliary inlet, and a drain hole. The separation assembly may be located in the interior chamber and fluidly communicated with the compressor supply inlet and the machine supply outlet so as to accumulate moisture condensate in the accumulation zone. The valve assembly may include a piston movable between an open and closed position. A biasing member may bias the piston toward the closed position. Auxiliary pressure provided through the auxiliary inlet may act on the piston and move the piston to the open position, thereby allowing the accumulated moisture condensate to drain.

Abstract: A brake clearing system useful for clearing mechanical components of one or more brake units provided on a freight trailer having an air storage reservoir. The system includes a flow controller, at least one delivery hose, and at least one discharge device. The flow controller is fluidly between the air storage reservoir and the auxiliary tank. The delivery hose is fluidly connected to an outlet of the flow controller and delivers pressurized air to the discharge device. The discharge device, in turn, is configured to direct pressurized air at components of one of the brake units. The flow controller can include an inflow control unit, an auxiliary tank, and an outflow control unit. In related embodiments, the auxiliary tank can include a heater.

Abstract: The present invention provides a system that automatically purges contaminants from an air pressure tank when the emergency brakes of a vehicle are set. In one preferred embodiment, the system comprises a valve comprising an input port, an exhaust port, and a control port. The input port is in fluid connection with a drain on the pressurized air tank, and the control port is in fluid connection with an emergency brake line of the vehicle. When the emergency brakes are engaged, the valve is open such that the input port and the exhaust port are in fluid connection operable for air and contaminants from the pressurized air tank to be expelled from the pressurized air tank through the exhaust port. When the emergency brakes are not engaged, the valve is closed such that the input port and exhaust port are not in fluid connection.

Abstract: A pressure governor includes a first valve that determines the introducing pressure and a second valve that determines the releasing pressure. A first valve receiving chamber in which the first valve is received and a second valve receiving chamber in which the second valve is received are formed independently from each other. Thus, there is no need to form the valves coaxially, and each valve can be easily fabricated with high accuracy by simple processing.

Abstract: Systems and methods for a vehicle brake booster having first and second chambers separated by a diaphragm coupled to a brake pedal are provided. In one example approach, a method comprises applying an exhaust pressure from a vacuum pump to a first chamber of the brake booster, and applying a vacuum pressure from the vacuum pump to a second chamber of the brake booster.

Abstract: An air dryer includes a supporting base, a drying agent container, and an outer cover. The supporting base includes an inlet for receiving compressed air to be subject to a drying process and an outlet for delivering the processed compressed air that has undergone the drying process. The drying agent container is a container supported on the supporting base, contains a drying agent in the interior, and enables the drying process to be performed by passing the compressed air from the inlet through the drying agent. The outer cover surrounds the outer side of the drying agent container on the supporting base and defines a chamber for storing the compressed air between itself and the drying agent container. The supporting base includes first and second mounting surfaces, which are oriented in different directions, and a plurality of inlets, which are oriented in different directions and receive the compressed air.

Abstract: An accumulator includes a cylinder for containing a working fluid and a first volume of pressurized gas, the gas and fluid being separated by a displaceable piston and a first seal contacting the piston and the cylinder, a reservoir carried on the piston for containing a second volume of pressurized gas, and a device that permits gas flow from the second volume into the first volume.

Abstract: A condensate trap is provided with a liquid supply hole and a liquid discharge hole, as well as a vapor discharge hole located in the upper side of the casing. A cylindrical chamber is located in the casing in which chamber an expansion piston can move. A hollow piston rod is attached to the lower side of the expansion piston. The liquid supply hole communicates with the chamber around the piston rod. The wall of the piston rod has throttling ports which extend in tangential direction. A siphon is located in the piston rod underneath the throttling ports. In the piston rod underneath the siphon is located a further throttling port, which can communicate with the liquid discharge hole when the expansion piston moves up. The space in a further chamber underneath the bottom of the piston rod communicates via a channel with the liquid discharge hole.

Abstract: A vehicle hydraulic oil reservoir assembly includes a main reservoir and an auxiliary reservoir. The main reservoir has a lower portion and an upper portion. The auxiliary reservoir has a lower portion and an upper portion. The auxiliary reservoir has a port formed in the upper portion thereof. The lower portion of the auxiliary reservoir is communicated with the lower portion of the main reservoir. A breather vent is in communication with atmosphere. A vent pipe communicates the port with the breather vent.

Abstract: The present invention provides a method, process and apparatus for effectively draining liquid condensate from compressed air/gas systems. The draining apparatus having a means to evacuate collected condensate from a chamber reservoir without a loss of system compressed air or gas in its discharge of the drainage to assure that contaminates and particulates in the liquid condensate do not collect and build-up in its inner chambers and orifices. The device reduces energy consumption as it relates to wasted compressed air/gas in the purging of liquid condensate.

Abstract: A controlled flow drain having an upper flange coupled to a lower flange. The upper flange defines an inlet cavity and the lower flange defines a swirl chamber. The inlet cavity and swirl chamber are in fluid communication via a swirl nozzle defined within a swirl nozzle plate that separates the inlet cavity from the swirl chamber. After separating debris within the drain fluid, the drain fluid is accelerated through the swirl nozzle and discharged into the swirl chamber, and more debris is thereby separated and eventually settles into an annular groove. The drain fluid may then exit the lower flange via an exit control passage. The swirl chamber may be flushed with a series of flushing liquid injection ports symmetrically-arrayed about the annular groove. Flushing the swirl chamber removes fluidized debris and also remove any built up fouling present on the swirl nozzle and exit control passage.

Abstract: A moisture control system generally comprising a collector element is configured to be incorporated into a structure to control moisture condensation on the interior and exterior of the structure. The collector element encourages condensation on its surface. The control system includes a channel in fluid communication with the collector element to direct the condensed liquid away from the control element.

Abstract: The present invention discloses multiple loop reactor wherein one of the settling legs transferring polymer product from one loop to a further loop can be taken out of service or re-opened without interfering with the operation of said multiple loop reactor.

Abstract: A drain valve for a vehicle compressed air system, which separates dirt, water, debris and other relatively heavy objects from a compressed air stream. The drain valve includes a sump with a tangential inlet. The tangential inlet creates a vortex within the sump that collects relatively heavy objects at the bottom of the sump and allows the compressed air to exit the drain valve through an outlet port located at the top of the drain valve. A pressure actuated valve and drain port allows for the water to be discharged from the drain valve while retaining the pneumatic signal.

Abstract: A coalescing type gas filter includes a filtering element enclosed in an inner chamber which is housed in an outer chamber and a drain device to simultaneously drain accumulated liquid in both the inner chamber and the outer chamber. The drain device contains a pressure sensitive valve that regulates opening of the drain in response to a drop in pressure.

Abstract: The invention relates to a mud suction unit having a suction element which is connected to a receiving container and has a motor for the generation of a suction flow and also has a discharging element attached to the receiving container.

Abstract: A fuel trap for a vehicle's fuel system, the liquid fuel trap comprises a housing adapted for fitting within the vehicle's fuel tank and at least one fuel fluid inlet port connectable to a fuel venting valve system, a gas outlet port connectable to a fuel vapor treating system; and a liquid fuel discharge assembly for discharging liquid fuel into the fuel tank, said liquid fuel discharge assembly fitted with a fluid propelling mechanism responsive to acceleration and buoyant forces, and to fuel motion within the fuel tank.

Abstract: An automated condensate drain system for gas flow elements is provided that includes a differential pressure transmitter, a sequence controller, and two condensate chambers for receiving and collecting accumulated moisture from air flow elements and transmitters. The condensate chambers are placed in low profile positions within the instrument piping system, requiring downward sloping of the instrument tubing to accentuate condensation drainage. The sequence controller initiates a drainage cycle (set as desired by operator), permitting the transmitter to enter an auto-zero cycle, thereby energizing an internal isolation valve in the transmitter while maintaining the transmitter output. The sequence controller energizes solenoid valves of the two condensate chambers, wherein the chambers open to permit drainage of accumulated moisture assisted by static pressure system.

Abstract: An automatic drain for a compressed air system can have a valve body containing an internal fluid reservoir which communicates via a main air inlet passage with a compressed air container such that fluid can flow from the air container into the internal reservoir. A filter can be provided prior to the internal reservoir so that only fluid passes into the internal reservoir. Accumulated fluid in the internal reservoir can be drained through a discharge port regulated by a valve assembly which can be opened and closed by a controller in response to the level of fluid accumulated in the internal reservoir as detected by a sensor.

Abstract: A pressure operated normally closed control valve operates to open at a predetermined pressure between the system minimum and maximum pressures to open the valve and allow the discharge of condensate from the system which has a source of pressure to provide a minimum and a maximum pressure. The system is subject to the formation of condensate. There is an inline filter at the inlet end of the valve and a discharge nozzle at the outlet end of the valve. The entrance to the discharge nozzle may also have a filter. The assembly can also be arranged so that the control valve is normally open and operates to open at a predetermined pressure at or below the system minimum pressure whereby condensate is removed, and to close the valve and prevent the discharge of condensate from the system when the pressure falls below the predetermined pressure.

Abstract: An automatic auxiliary condensate drain for an automatic dry-pipe type fire protection sprinkler system, wherein condensation which forms within the sprinkler system due to changes in temperature is drained from the condensate reservoir at the direction of a programmable controller. The programmable controller coordinates the opening and closing of inlet and outlet valves so that accumulated condensate is drained from the system, yet the pressurized gas located in the sprinkler system is not allowed to escape. Actuators operate the inlet and outlet valves in response to signals from the programmable controller.

Abstract: An automatic auxiliary condensate drain for an automatic dry-pipe type fire protection sprinkler system, wherein condensation which forms within the sprinkler system due to changes in temperature is drained from the condensate reservoir at the direction of a programmable controller. The programmable controller coordinates the opening and closing of inlet and outlet valves so that accumulated condensate is drained from the system, yet the pressurized gas located in the sprinkler system is not allowed to escape. Actuators operate the inlet and outlet valves in response to signals from the programmable controller.

Abstract: A pressure operated normally closed control valve operates to open at a predetermined pressure between the system minimum and maximum pressures to open the valve and allow the discharge of condensate from the system which has a source of pressure to provide a minimum and a maximum pressure. The system is subject to the formation of condensate. There is an inline filter at the inlet end of the valve and a discharge nozzle at the outlet end of the valve. The entrance to the discharge nozzle may also have a filter. The assembly can also be arranged so that the control valve is normally open and operates to open at a predetermined pressure at or below the system minimum pressure whereby condensate is removed, and to close the valve and prevent the discharge of condensate from the system when the pressure falls below the predetermined pressure.

Abstract: A method for draining condensate off a compressed-gas system that traps condensate that collects during operation of the compressed-gas system, draws off collected condensate through an outlet, connects a trap volume and a purging device to the outlet, connects a collection chamber to the outlet, detects the presence of condensate in the collection chamber by at least one sensor, connects control electronics to the sensor, controls a valve arrangement by the control electronics that either shuts the purging device so that no condensate can escape through it or opens the purging device each time the condensate level rises and the sensor changes over from indicating “no condensate” to indicating “condensate present”, starts the timer circuit and on expiry of the time defined by the timer circuit, opens the valve until the sensor indicates “no condensate” thereupon closing the purging device with the valve.

Abstract: The invention is a continuously operated condensate drain valve operating in real-time response to the presence of an electrically conductive media in the interior chamber of the condensate drain valve. The invented valve includes a valve body, a subminiature sensor embedded in the valve body and an electric control circuit electrically connected to the sensor. Because the sensor is located in the valve body and because the control circuit does not include a delay means, the invented valve can operate at an extremely high cycle rate thereby keeping the air compression system virtually condensate free. Consequently, the invented valve enables an air compressor to maintain optimal capacity and to operate at an unprecedented level of efficiency.

Abstract: A purge valve for expelling liquid contaminants from a fluid conduit which is normally unpressurized but is at times pressurized with a gas which contains liquid contaminants. It has a housing, a diaphragm mounted within the housing, a control chamber on a first side of the diaphragm, an exhaust passage on a second side of the diaphragm and a valve seat surrounding the exhaust passage. The valve seat is positioned so that the diaphragm can seal against it. A spring on the second side of the diaphragm presses it away from the seat. An annular chamber is on the second side of the diaphragm, surrounding the exhaust passage. The annular chamber is open to the exhaust passage when the diaphragm is unseated from the valve seat. The valve has a low impedance flow path between the control chamber and the fluid conduit. The valve also has a high impedance discharge flow path connected to the annular chamber.

Abstract: The invention is a valve for expelling a liquid contaminant from a gas in a conduit. It is used for a conduit with a pressure subject to variations in time. The valve has a housing containing a diaphragm with a control chamber on one side of the diaphragm and an exhaust passage on the other side. A valve seat surrounds the exhaust passage. A spring presses the diaphragm against the valve seat so that the valve is normally closed and an annular chamber surrounds the exhaust passage. A low impedance discharge passage is connected to the annular chamber and to the conduit. A high impedance control passage is connected to the control chamber and is either connected to the discharge passage or to the conduit. When the conduit pressure remains constant in time, the pressure in the control chamber equilibrates with it so that a net pressure force on the diaphragm plus the spring force presses the diaphragm against the valve seat so that the valve is closed.

Abstract: A drain valve of an air braking system for vehicles has a drainage piston, a main sump and auxiliary sump. Moisture passes from the main sump to the auxiliary sump in response to pressure at a signal port which closes off air supply through ports. A reduction in pressure at the signal port causes the ports to be reconnected and allows moisture to be expelled through the drainage outlet.

Abstract: A drain valve removes liquid from a compressed air system whenever cycling pressure of the system reaches either a preselected high drain pressure or a preselected low drain pressure at an inlet port of the valve. An inlet face of a piston of an adjustable pressure valve assembly within a valve body normally seals the inlet port when there is no pressure. The piston is located within a portion of a central cavity of the valve. The piston's inlet face is of a size which allows the force of the adjustable pressure valve assembly to be overcome by a pre-selected high drain pressure at the inlet port. The area of a vent face on the other side of the piston has a size which, when the vent face is sealing the vent passageway, prevents the force exerted by the adjustable pressure valve assembly from overcoming the pressure of the compressed air system until a pre-selected low drain pressure is reached at the inlet port.

Abstract: Water release valve for a compressed air system. It has a service connection for attachment to a low point of the compressed air system. The valve has a body which has an internal space, part of which is a cylindrical bore. It also has a pilot connection for attachment of a pilot pressure obtained from the compressed air system, and the valve has an exhaust port for releasing air and water from the system. It has one or more pistons placed in the cylindrical bore. At least one of the pistons has a position determined by the pilot pressure. The piston closest to the service end may be placed in two different positions. In one of the positions, it closes the flowpath from the service connection to the exhaust. In the second position, it opens the flowpath.

Abstract: A gas dryer having a housing, an outlet chamber, a pressure relief space, and a connection connecting the outlet chamber to the pressure relief space. An outlet valve is located within the connection connecting the outlet chamber to the pressure relief space. A piston which actuates opening and closing of the outlet is subjected to pressure contained in a control chamber. This pressure urges the outlet valve into an open position. The gas dryer also has an auxiliary valve system which is located between the control chamber and the pressure relief space. The auxiliary valve system controls the flow of the pressure medium between the control chamber and the relief space.

Abstract: Water release valve for a compressed air system. It has a service connection for attachment to a low point of the compressed air system. The valve has a body which has an internal space, part of which is a cylindrical bore. It also has a pilot connection for attachment of a pilot pressure obtained from the compressed air system, and the valve has an exhaust port for releasing air and water from the system. It has one or more pistons placed in the cylindrical bore. At least one of the pistons has a position determined by the pilot pressure. The piston closest to the service end may be placed in two different positions. In one of the positions, it closes the flowpath from the service connection to the exhaust. In the second position, it opens the flowpath.

Abstract: An improved relay valve (10) having a supply port (16), a delivery port (18), an exhaust port (20), a control port (17), a relay piston (14) controlling communication between the supply port (16), the delivery port (18), and the exhaust port (20) in response to a pneumatic signal applied to the control port (17) and including a passage (40) extending through the piston (14) to the exhaust port (20) for draining to atmosphere moisture and other contaminants which build up on the top of the piston (14). A diaphragm element (30) having a cylindrical protrusion portion (36) is disposed in the piston (14) above the passage (40) to act as a check valve and seal the passage (40) when a pneumatic signal is applied to control port (17). The diaphragm element includes a top resilient portion (32) which serves as a spring to open the drain passage when no signal is applied to control port (17).

Abstract: A condensate drainage system for pneumatic tanks is disclosed. Large vehicles typically use compressed air for operating various vehicle functions such as its brakes. In conjunction with the use of compressed air there is provided a pneumatic system including a compressor and pneumatic storage tanks. Because of the properties of compressed air, it is necessary to drain condensates and contaminants from the pneumatic storage tanks in order to prevent the condensates and contaminants from migrating throughout the air system, and interfering with the operation of, the brakes. Accordingly, electrically controlled drain valves are connected to the pneumatic tanks for purging condensate and contaminants. A logic controller which receives inputs from sensors and determines an engine status controls the operation of the drain valves so as to optimally purge condensates and contaminants. The controller includes a CPU, programmable memory, and a timer.

Abstract: A contaminant-ejecting, pneumatically-controlled brake booster valve is disclosed. The valve comprises an exhaust piston slidably mounted within the stem of a main piston of the valve, wherein the exhaust piston is actuated by supply air pressure to periodically open and close an exhaust passageway leading from the main piston chamber to an exhaust area. Pressurized supply air normally forces the exhaust piston in the exhaust passage blocking position thereby preventing the escape of control air through the exhaust passageway. When supply pressure is released (e.g. when the parking brake is applied), pressurized control air forces the exhaust piston upward, allowing some of the control air to escape through the exhaust passageway to the exhaust area. The escaping control air expels any moisture or other contaminants that may have accumulated in the main piston chamber. Additionally, a check valve is positioned in an orifice of the main piston.

Abstract: An automatic air compressor drain device which is enabled and disabled by the control of a timer to turn on a solenoid for guiding the air from the air tank of an air compressor into the drainer, where the force of the compressed air pushes up the piston central shaft to open up the water inlet and allow automatic drain by the air tank, and to close up the drainer inlet when the piston central shaft is pulled down by spring load force to complete the cycle of automatic drain.

Abstract: A system for automatically controlling a drain valve connected to a sootblower steam piping system utilizes two temperature measurements, one near the steam source and the other near the drain valve. Comparison of the difference in steam temperature between these two locations with an adjustable temperature setpoint allows the drain valve to be opened to drain condensate and maintain minimum allowable superheat over a wide range of conditions. The system allows the temperature sensing to "float" with steam source conditions, since it is continuously adjusted to compensate for steam source temperature and ambient temperature changes.

Abstract: The invention relates to a drain valve and a method designed to drain condensate and contaminants from a wet tank in a pneumatic braking system for a vehicle. In a preferred embodiment the drain valve comprises a cylindrical piston disposed to slide axially within a cavity in a valve body constructed to be mounted on the vehicle and having two openings in the side wall of the valve body communicating with the cavity, one, an inlet opening connected upwardly to the wet tank, and, two, an outlet opening connected downwardly as a drain. The outlet is blocked in a closed, first position of the piston when the vehicle ignition is turned on. When the vehicle ignition is turned off the piston moves from the first position to a second position so as to open both the inlet and outlet openings together through the cavity in order to drain the wet tank. When the vehicle ignition is turned to the "on" position the piston moves back to the first position within the cavity so as to close the drain valve.

Abstract: An automatic air tank drain is provided by forming a venturi induced suction at the tank outlet which draws liquid out of the tank as the tank air is exhausted past the venturi through a flexible hose positioned by a weight at the tank bottom.

Abstract: An automatic drain device in an air compressor system includes an electrode sensor in a liquid collection cell. An electronic control detects an electrical change in the electrode sensor resulting from contact with liquid in the liquid collection cell and energizes a drain valve for a predetermined time effective to drain the liquid collection cell. A cycle timer triggers the energization of the drain valve when the electrode sensor fails to provide the required electrical change for a predetermined cycle time. Test inputs permit driving the electronic control to simulate sensing of liquid, and also permit energization of the drain valve without involving the remainder of the electronic control.

Abstract: The manual valve normally attached to the wet tank of an air pressure system in a motor vehicle which accumulates moisture is replaced by an automatic valve which has an inlet port connected to the drain line from the wet tank and an outlet port vented to the atmosphere. This valve is operable between an open position where the inlet and outlet ports are interconnected and a closed position where these two ports are isolated from each other. An air line which is used to activate the valve is interconnected to the parking brake of the motor vehicle and is operable to move the valving means to the closed position during normal operation of the vehicle and to the open position whenever the parking brake is engaged to thereby automatically drain moisture from the wet tank while the vehicle is parked.

Abstract: An expansion chamber is attached between two air compression stages of an air compressor or between an air compression stage and the air holding tank of the air compressor. The expansion chamber has a cylindrically shaped wall with top and bottom portions attached so as to define an enclosed inner chamber. The enclosed inner chamber may have one or more baffle plates located therein. Various designs of baffle plate arrangements provide different air circulating patterns within the expansion chamber. Since the expansion chamber is exposed to the ambient environment, the compressed air heated in the compression process is cooled down in the expansion chamber. This cooling down of the compressed air as well as the expansion of the compressed air as it circulates within the enclosed inner chamber causes any moisture suspended in the compressed air to drop out and go to the bottom of the expansion chamber.

Abstract: A multistage compressor includes a lower pressure side compression part, a higher pressure side compression part, an intermediate conduit placing the lower and higher side compression parts in communication, and a cooler disposed midway of the intermediate conduit for allowing gas to flow from the lower pressure side compression part to the higher pressure side compression part and for cooling the flowing gas. The cooler includes a drain outlet port. The compressor further includes an electromagnetic valve disposed at the drain outlet port and a controller for controlling the valve. The valve is opened when the compressor is started or re-started after a pause, is kept open during a predetermined period of time, and is then closed.

Abstract: An apparatus having an automatic purge valve assembly for draining condensate out of a compressed air storage tank. An air pressure switch, upon the presence of a predetermined atmospheric pressure in the air storage tank, will energize a relay which in turn enables a solenoid to open a purge valve, thus allowing any condensate present in the tank to be automatically drained through and out of an air outlet conduit to which the purge valve is attached. The relay shuts off automatically after only a brief period in order to quickly close the purge valve and thus avoid having a substantial amount of compressed air escape along with the condensate.

Abstract: A drain valve for a compressed air tank is pneumatically activated by the residual air which is released from an air compressor when the air compressor comes to a stop after an active cycle. The invention allows for consistent and reliable draining of condensation from a compressed air tank. The energy of the residual air released is used to operate the valve. Under favorable conditions, the valve is operated at a frequency proportional to the rate of moisture condensation.

Abstract: Valving apparatus for use in automotive vehicles which employ an air pressure system utilizing an air pressure tank, a wet tank interconnected to the air pressure tank for accumulating moisture and a manual valving system for draining moisutre from the wet tank. The manual valve is replaced by an automatic valve which has an inlet port connected to the drain line from the wet tank and an outlet port vented to atmosphere and operable between open and closed positions. The valve actuation means is interconnected to the electrical system of the vehicle and also to the pressure system of the vehicle and is operable to move the valving means to a closed position during operation of the vehicle and to an open position during vehicle shut down to automatically drain moisture from the wet tank while the vehicle is idle.

Abstract: The invention provides an automatic drain device with membrane for pneumatic circuits. A flexible membrane (11) which separates the opening (2) of a jar (1) from a drain pipe (6) is precurved in a top position against this opening and against a skull-cap (8) against which it bears, which skull-cap then closes a communication orifice (14) provided on one side of the membrane. Under the action of the pressure in the jar, the membrane moves down to come to bear against a discharge end-piece (5) freeing, during this movement, orifice (14) and making drainage possible.

Abstract: A fluid draining system for an electric power generator of the type containing a cooling gas under pressure includes oil-pressurized shaft seals adjacent the rotor bearings, to prevent the pressurized gas from escaping through the bearings. Oil is at a pressure higher than the pressurized gas and means are provided to automatically drain leakage oil from the bottom of the generator. The automatic drain includes a differential pressure valve with its first inlet connected to the drain in the bottom of the generator, its second inlet connected to the gas pressure within the generator, and its outlet completing the drain path for the system when the differential pressure of the first inlet exceeds that of the second inlet by a preset amount.